Prop nut thread specs

[airshot]

My old Minn Kota model 65 trolling motor has a plastic prop nut that has broken. Looking to replace it with metal one. Searched all over for the thread specs, even the MK website, only part numbers, no thread info.
It has the 3.25" dia motor housing, can't believe the thread spec is a big secret. Anyone else replaced their plastic prop nut and what is the thread.?

 

[Fun Times]

Pretty sure I was able to find it for you airshot.

Item number 194, Part Number 2053101, NUT-PROP,NYLOC (MED) 5/16 SS 1
Item number 192, Part Number 2151726, WASHER-5/16 STD (S/S) 1

https://www.fish307.com/content/MK_2024/Edge_FC_70.pdf

• Compatible with 3-1/4" and 3-5/8" diameter, 12 volt and 24 volt trolling motors.
• This kit will fit most Minn Kota trolling models with 70 lbs of thrust or less from 1991 - Present. These models will have a black composite shaft from the lower unit up to the head unit.

Parts Included in this kit:

Quantity	Part Number	Description
2	2092600	Stainless Steel Drive Pin
2	2053101	Nylock Nut
2	2151726	Stainless Steel Washer

Minn Kota MKP-9 Prop Nut Kit A PNKA

Part Number: PNKA Product Code: 1865010 Minn Kota MKP-9 Prop Nut Kit A Quickly, easily remove or replace your prop with this kit. Each kit includes a prop nut and washer. A crescent wrench is required for installation. FEATURES: Quickly, easily remove or replace your prop with this kit. Each...

northlandmarine.com

1 - Nylock Prop Nut 5/16-24 x .265 Stainless (2053101)
1 - Prop Washer 5/16" Stainless (2151726)
1 - Shear Pin 1/8" Diameter Stainless (2092600)
For Use With:
- Minn Kota 30-70 lb. Thrust Models.

Minn Kota Prop Nut Replacement Kit (30-70#)

America's Largest Trolling Motor Supercenter. Parts and Accessories. Online Shopping. Fast Shipping. Huge Inventory.

trollingmotorparts.com

Just so the info is out there there's one other size mentioned but it seems to fit bigger motors vs your setup and that is part number 2093101...

• For use with 80 - 112 lbs of thrust, 4" and 4-1/2" diameter, 24 volt and 36 volt Minn Kota trolling motors..., https://northlandmarine.com/collections/props/products/minn-kota-prop-nut-kit-e
• APPLICATION -- Compatible with Minn Kota Props: MKP-33 Weedless Wedge 2 Props for 4" diameter motors (part number 233160 / 1865018).
• MODEL -- MKP-34 Prop Nut Kit - E, Replace# 1865019.
• FUNCTION -- With this kit, you will be able to Quickly & Easily remove or replace your prop. A must have kit.
• KIT INCLUDS -- MKP-34 Prop & Nut Kit E includes 2 X Prop nuts (2093101 3/8"-24), 2 X Large shear pins (2262658 1" x 3/16") and 2 X Washers (2091701). Note: A crescent wrench is required for installation.
• https://www.amazon.com/Camoo-MKP-34-Minnkota-trolling-1865019/dp/B086VG2QZ2

While searching, the following statement from the link below it seemed to be a concern so wondering what shaft type is on yours?
This prop will only work with motors that have a black, fiberglass, composite shaft that goes from the lower unit up to the head unit. If your trolling motor has a chrome shaft this prop will not fit.

Minn Kota Power Prop 2061122

Part Number: 2061122 Product Code: 1865002 Old Part Number(s): 1378121, 2061121 Minn Kota MKP-2 Power Prop Includes prop, drive pin, prop nut and washer This prop will fit most Minn Kota Trolling Motors with a 3-1/4" diameter lower unit. Typical thrust levels include 28, 30, 32, 34, 36, 38...

northlandmarine.com

https://minnkota.johnsonoutdoors.com/us/shop/accessories/trolling-motor/prop-nut-kit-mkp-9?v=102336&bvnotificationId=604904e3-8a41-11ef-9ee5-0e095ae036af&bvmessageType=QUESTION_ANSWERED&bvrecipientDomain=verizon.net#answer/7462028

 

[airshot]

Many thanks, but it has a different pitch than a std 5/16 thread. Gonna have to drive over to the shop and get my thread gages and measure. Was hoping someone might already know. Shop is a 30 mile drive each way...guess I am cheap...

 

[airshot]

Did find a 5/16" fine thread nut (5/16-24) I think that us it for the prop nut. The one I found was messed up a bit but just chased a tap thru it and when the storms stip, I will go check it for sure. It does make sense they would use a fine thread due to vibrations and all.

 

[airshot]

Yep.... The fine thread was it !!